The big man's grip tightened on his twin's arms convulsively.

At the same time his fingers tightened convulsively on the flashlight.

She tightened convulsively around his finger, nearly making him climax on the spot.

Tom's hand, reaching back, tightened convulsively on his friend's shoulder.

Her throat tightened convulsively with a mix of fear and thrill.

Bertrand's hands tightened convulsively around the arms of the chair even as he spoke.

She started to release him, but the cheeks tightened convulsively under her hands to the sound of a heavy blow.

He looked at her and her grip on him tightened convulsively.

He saw her hand tighten convulsively on her father's arm.

His arms tightened convulsively about the boy as the realization struck.